linux-kernel - Re: [Bug #12650] Strange load average and ksoftirqd behavior with 2.6.29-rc2-git1

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Message-ID: <20090216200923.GA28938@elte.hu>
Date:	Mon, 16 Feb 2009 21:09:23 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Damien Wyart <damien.wyart@...e.fr>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mike Galbraith <efault@....de>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>
Subject: Re: [Bug #12650] Strange load average and ksoftirqd behavior with
	2.6.29-rc2-git1


* Paul E. McKenney <paulmck@...ux.vnet.ibm.com> wrote:

> Here the calls to rcu_process_callbacks() are only 75 
> microseconds apart, so that this function is consuming more 
> than 10% of a CPU.  The strange thing is that I don't see a 
> raise_softirq() in between, though perhaps it gets inlined or 
> something that makes it invisible to ftrace.

look at the latest trace please, that has even the most inline 
raise-softirq method instrumented, so all the raising is 
visible.

	Ingo
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